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Theoretical Study of Iridium Complexes with Phenylpyridine Based Ligands and Phosphines

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Abstract:

Recently, iridium complexes with phenylpyridine based ligands and phosphines, Ir(C ∧ N)2 (PPh3 (CN), [(C ∧ N) = dfppy, dfMeppy] are reported as blue phosphorescent OLED materials. These iridium complexes have novel blue color and emit light at 441 nm to 439 nm. However, these complexes have low external quantum efficiency because they exhibit less MLCT than iridium complexes with phenylpyridine, and some other ancillary ligands. To improve quantum efficiency of iridium complexes with phenylpyridine based ligands and phosphines, a time dependent density functional theory (TDDFT) study of these phosphors was performed. Using these results, this paper discusses how the ancillary ligand influences the emission peak, as well as the metal to ligand charge transfer (MLCT) transition efficiency.

Keywords: HETEROLEPTIC IRIDIUM COMPLEX; OLED; PHOSPHORESCENCE; TDDFT

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.3624

Publication date: May 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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